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Effects of Auxins on Gametophyte Development and Sexual Differentiation in the Fern Ceratopteris thalictroides (L.) Brongn.

Leslie G. Hickok and Randy M. Kiriluk
Botanical Gazette
Vol. 145, No. 1 (Mar., 1984), pp. 37-42
Stable URL: http://www.jstor.org/stable/2474511
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Auxins on Gametophyte Development and Sexual Differentiation in the Fern Ceratopteris thalictroides (L.) Brongn.
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Abstract

The auxins indole-3-butyric acid (IBA), α-napthaleneacetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), and indole-3-acetic acid (IAA) were tested for their effects on gametophyte development in the fern Ceratopteris thalictroides. Both 2,4-D and NAA affected gametophyte growth, cell size, antheridia number, and rhizoid development at concentrations of 10-6 M or greater. The effects of IAA were observed only at 10-4 M; growth of gametophytes was inhibited, and male/female differences were less pronounced. Normal development of male and female morphologies, which is mediated by an antheridiogen, was severely altered by IBA. While a sex ratio of 3 males to 1 female is normally evident in multispore cultures of gametophytes, all gametophytes were male at 10-4 M IBA. This effect was related to growth inhibition by IBA; IBA did not directly substitute for antheridiogen.

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